Classifications

• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
  • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
  • G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
  • G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
  • G11B27/30—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording
  • G11B27/3027—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording used signal is digitally coded
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
  • G11B20/10—Digital recording or reproducing
  • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
  • G11B20/10—Digital recording or reproducing
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
  • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B2220/00—Record carriers by type
  • G11B2220/20—Disc-shaped record carriers
  • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
  • G11B2220/2537—Optical discs
  • G11B2220/2541—Blu-ray discs; Blue laser DVR discs

Definitions

• the present invention relates to a recording medium and methods and apparatuses of
• An optical disk has been widely used as an optical recording medium to record large amounts
• BD blu-ray disc
• HD-DND high definition video data and superior sound quality audio
• the BD has been spotlighted as a next generation of HD-DND and as a next generation
• optical recording solution for storing more data than a conventional DND. Standardizing
• optical recording apparatus for the BD since the technical specifications of the BD are not completely standardized.
• auxiliary data such as text subtitle information may be provided along with the
• main AN data and sub- or auxiliary data main AN data and sub- or auxiliary data.
• the present invention relates in part to a recording medium having a data structure for
• a recording area of an example recording medium stores a text
• subtitle stream that includes a dialog style segment and at least one dialog presentation
• the dialog style segment includes at least
• Each set of style information provides region positioning
• the dialog presentation segment includes at least one
• the region subtitle information includes text subtitle data (e.g., text subtitle data).
• the region style identifier identifies one of the sets of style information in the dialog style segment to apply to the text
• the region position information may provide a horizontal position and a vertical position of
• each set of style information may further include region size information
• each set of style information includes user changeable information that
• the text box position information provides a horizontal position and a
• each set of style information may further include text box size
• font size information indicating a font size to apply to text subtitle data in the text box
• font color information indicating a color to apply to
• each set of style information may include user changeable information
• the text box whether the user may one of increase and decrease the height of the text box,
• Each set of style information is associated with one of the sets of style information.
• Each set of style information is associated with one of the sets of style information.
• positioning information for positioning a text box in the region and an indicator of a
• the present invention also related in part to methods and apparatus associated with the
• a text subtitle stream is recorded on the recording medium.
• the text subtitle stream includes a dialog style segment and at least
• dialog style segment associated with the dialog style segment.
• segment includes at least one set of style information.
• Each set of style information provides
• region positioning information for positioning a region in an image and text box positioning
• the dialog presentation segment includes
• the region subtitle information includes text subtitle
• style data e.g., style data and/or text string data
• region style identifier e.g., region style identifier
• identifier identifies one of the sets of style information in the dialog style segment to apply to
• an apparatus for decoding text subtitle data includes a subtitle
• decoding unit decoding a text subtitle stream, and an associated method includes decoding
• the text subtitle stream includes a dialog style segment and at least
• dialog style segment associated with the dialog style segment.
• segment includes at least one set of style information.
• Each set of style information provides
• region positioning information for positioning a region in an image and text box positioning
• the dialog presentation segment includes
• the region subtitle information includes text subtitle
• style data e.g., style data and/or text string data
• region style identifier e.g., region style identifier
• identifier identifies one of the sets of style information in the dialog style segment to apply to
• an apparatus for decoding text subtitle data includes a subtitle
• decoding unit decoding a text subtitle stream, and an associated method includes decoding
• the text subtitle stream includes at least one set of style information
• Each set of style is a set of style
• box positioning information for positioning a text box in the region, and an indicator of a
• FIG. 1 illustrates a file structure of a high density optical disk in accordance with an example
• FIG. 2 illustrates a formation of a file structure and related information recorded in a high
• FIG. 3 shows a text subtitle stream displayed simultaneously with a main AN stream in single
• FIG. 4 is a diagram showing a file structure with file information for explaining a method for managing reproduction of a text subtitle in accordance with an example embodiment of the
• FIGs. 5 A to 5 C illustrate a reproduced main AN stream with a related subtitle displayed at a
• FIG. 6 illustrates a text subtitle stream file structure in accordance with an example
• FIG. 7 illustrates a dialog style unit (DSU) and a dialog presentation unit (DPU) included in a dialog style unit (DSU) and a dialog presentation unit (DPU) included in a dialog style unit (DSU) and a dialog presentation unit (DPU) included in a dialog style unit (DSU) and a dialog presentation unit (DPU) included in a dialog style unit (DSU) and a dialog presentation unit (DPU) included in a
• FIGs. 8 and 9 show the syntax of a text subtitle stream in accordance with an example
• FIGs. 10A to 12C show the syntax of a dialog style unit in a text subtitle stream in
• FIGs. 13 A and 13B show the syntax of a dialog style unit in a text subtitle stream in
• FIGs. 14A to 14G ' show the syntax of a dialog style unit in a text subtitle stream in
• FIG. 15 illustrates a data structure recorded in a text subtitle stream in accordance with an
• FIG. 16 illustrates a decoding unit of an optical disk reproducing apparatus having a text
• FIG. 17 illustrates a text subtitle stream decoder in accordance with an example embodiment
• FIG. 18 illustrates a method for reproducing a text subtitle stream in accordance with an
• a main data is title information recorded in an optical disk
• video and audio data is recorded based on the MPEG2 format and is called as a main AN
• Auxiliary data represents data related to the main data that is provided to a user for
• the auxiliary data includes subtitle information
• the auxiliary data are recorded based on a MPEG2 format by multiplexing with the main AN
• the subtitle as the auxiliary data is generally a closed caption displayed at a predetermined
• the subtitle is displayed at a region of the display with the video image by selecting the
• the subtitle may be provided in various formats.
• subtitle data recorded in the optical disk and a file structure for managing the main data
• FIG. 1 illustrates a file structure for managing various data on a disc in accordance with an
• At least one BD directory BDMN At least one BD directory BDMN
• an object file MovieObject.bdmv are included as general file (upper file) information to
• text subtitle hereinafter called text subtitle
• subtitle stream independently exist in the stream directory STREAM. Because the text subtitle streams files and AN stream files are recorded in the MPEG2 format (e.g., MPEG2
• '*.m2ts' is used the extension name of each stream file (e.g., 01000.m2ts,
• the AN stream may be called a clip stream file. Relating to the BD specifications, the AN stream may be called a clip stream file.
• the text subtitle data will exist in the form of a separate file from the AN
• the text subtitle data exists as the text subtitle stream file
• the clipinfo (or clip information) directory CLIPI ⁇ F includes clip information or clipinfo
• mapping As a management file. More specifically, the information in the clipinfo file includes mapping
• SPN Serial Number
• a stream file and the corresponding clipinfo file may be called a "clip", collectively.
• the file "OlOOO.clpi" in the clipinfo directory CLIPINF has attribute information
• the playlist directory PLAYLIST includes playlist files *.mpls, each having at least one
• the playitem Playltem designating a playing interval of a particular clip.
• the playitem Playltem designating a playing interval of a particular clip.
• the EP map of the named clipinfo file allows a particular stream address or
• reproduction of the playitem results in reproduction of the clip.
• the playlist file *.mpls serves as a basic management file for playing a desired clip by
• the playlist file *.mpls may also provide
• SubPlayltem for managing reproduction of, for example, supplemental data
• SubPlayltem is synchronized with the Playltem to play back
• auxiliary data including text subtitles is managed
• the auxiliary data directory AUXDATA is an area for separately recording auxiliary data
• subtitle playback, and the like are recorded therein.
• the text subtitle stream 10001.m2ts which is a kind of auxiliary data, may be
• MovieObject.bdmv exist as general files to secure interactivity with a user.
• index file index.bdmv has an index table providing menu information and title information
• the MovieObject.bdmv provides navigation commands for, for example,
• executing a playlist and may be called from a selection made in the index table.
• FIG. 2 shows a format of the file structure and related information recorded in the optical
• the optical disk includes a file system information area, a database area and a stream
• System information for managing files is recorded in the file system information area.
• the main data includes audio, video and
• auxiliary data includes the text subtitle. Also, the auxiliary data is
• auxiliary data is recorded in the stream area without being multiplexed with the main data.
• the user decides a method for reproducing the main data and the auxiliary data based on information stored in the database area and in the stream area.
• FIG. 3 shows a display simultaneously displaying a text subtitle stream and the main AN
• FIG. 4 is a diagram showing a file structure with file information for explaining a method for
• the text subtitle is managed by a subplayitem in a playlist and one
• subplay item manages reproduction of a plurality of text subtitle clips.
• the playlist file includes at least one or more playitems managing reproduction of
• FIG. 4 shows an English text
• subtitle clip 1 and a Korean subtitle clip 2 in a playlist file, and shows that subtitle clipl and
• subtitle clip 2 are synchronized, in time, with the main AN data. Namely, a subtitle clip is
• FIGs. 5A to 5C show a reproduced main AN stream with related subtitle displayed on a
• FIG. 5A
• FIG. 5B shows region information
• FIG. 5C shows style
• FIG. 5A shows the dialog information as the management information for managing
• a dialog information is management information for
• the presentation time is a time for reproducing corresponding subtitle and it is
• the text subtitle is displayed as two lines at PTS(k) and PTS(k+l), the text
• subtitle is defined as identical dialog.
• text subtitle data in a single
• dialog is less than 100 character codes.
• FIG. 5B shows region information among the management information.
• the region is
• the region represents a
• a single dialog has at most two regions. That is, in this embodiment, the dialog may be constructed with a single region or with two regions.
• FIG. 5C shows the style information of the management information.
• the style information is not limited to
• the style information is divided into global style
• the global style information is style information identically applied to the regions and it
• FIG. 5C shows the two different region style information (region_styles) are
• the local style information is style information applied according to each text data line in a
• This information may be called
• inline_styles may be style information defined for a text data when
• the region_styles is modified.
• inline style information inline_styles
• FIG. 6 illustrates a structure of a text subtitle stream file.
• FIG. 6 shows the
• the text subtitle stream is constructed as a MPEG2 transport stream.
• transport stream includes a plurality of transport packets and an identical packet identifier
• a single packet elementary stream includes a plurality of transport packets TPs.
• the first packet elementary stream (PES) in the text subtitle stream includes a dialog
• dialog style unit DSU (alternatively referred to as a dialog style segment DSS), which includes a set
• the second and succeeding packet elementary streams each include a
• dialog presentation unit DPU (alternatively referred to as a dialog presentation segment DPS),
• dialog information defined in FIGs. 5A to 5C includes the DPU, and style
• dialog information of dialog information includes inline style information (inline styles) and linking
• the dialog style unit includes . a maximum number of region styles sets.
• the dialog style unit includes maximum 60 region styles sets and they are
• region_style_id distinguished by unique region style identification (region_style_id) assigned to each region
• FIG. 7 illustrates a dialog style unit (DSU) and a dialog presentation unit (DPU) included in a dialog style unit (DSU) and a dialog presentation unit (DPU) included in a dialog style unit (DSU) and a dialog presentation unit (DPU) included in a dialog style unit (DSU) and a dialog presentation unit (DPU) included in a dialog style unit (DSU) and a dialog presentation unit (DPU) included in a
• dialog style unit includes a maximum of 60 region styles sets
• region_style_id The region style set includes various region styles and a user changeable
• the dialog presentation unit includes text data and PTS set, which is a set of
• the DPU also includes style information applied to each
• the DSU includes region_style_id for linking region style information to a
• DPU#1 includes dialog presentation information of single region.
• region style applied to text data #1 is region style set #k in the DPU since the DPU#1
• the DPU #2 include two regions.
• the first region of text data #1 is assigned with a region
• Region_style_id n. Similarly, region style set #n and region style set #m are applied to
• the style information linked by the region_style_id is identically applied to the text data in
• FIG. 8 shows the syntax of a text subtitle stream (Text_Subtitle_stream()) in accordance with
• the text subtitle stream As shown in FIG. 8, the text subtitle stream
• (Text_Subtitle_stream()) includes a single DSU(dialog_style_unit()) defining a style
• a function Text_Subtitle_stream() includes a function
• dialog_style_unit() and a function dialog_presentation_unit().
• the text subtitle stream is
• FIG. 9 shows the syntax of a dialog style unit (DSU). As mentioned above, the DSU is defined by the function dialog_style_unit() and FIG. 9 shows a detailed structure of the DSU.
• DSU dialog style unit
• dialog_style_unit() As shown in FIG. 9, the dialog_style_unit() includes a function
• dialog_styleset() The function dialog_styleset() defines a style information set corresponding
• the DSU includes style information set having various style
• FIGs. 10A to 10C are views of the dialog.
• FIGs. 13A to 13C show functions and diagrams for explaining a first embodiment
• FIGs. 14A to 14G illustrate functions and diagrams for explaining a second embodiment and FIGs. 14A to 14G
• FIG. 10A to FIG. 12C shows functions and diagrams for defining a style information set of a
• the first embodiment for defining the style information set is characterized by
• FIG. 10A shows a detailed structure of the dialog_styleset() syntax defined in the function
• dialog_style_unit() of FIG. 9 in accordance with the first embodiment of the present
• the flag player_style_flag indicates whether
• user_chageable_styleset() provides a modification range of the style information.
• the region style information is the global style information defined according to each region
• region_style_id is assigned to each of region
• the region style information of the dialog is provided based on
• the dialog is reproduced by applying the style information set defined based on the identical
• style information included in the style information set provided
• region_horizontal_position region_vertical_position
• region_width region_width
• region_bg_color_entry_id is provided for defining a background color of
• text box information is provided for representing a size of a text box in the
• the text box represents a region where the text data is displayed in the corresponding region.
• the size of the text box is set forth by text_box_width and the_box_height.
• text_flow is defined for defining a direction for displaying text
• text_alignment is defined for defining a direction for aligning text such as right, left and
• each region in the corresponding dialog is defined to have
• a line_space is defined for controlling the space between lines in a corresponding region as
• style information included in the style information set includes a font_id, a font_style, a
• font_size and a font_color_entry_id are defined as font information for controlling text data
• the player_style_flag in the dialog_styleset() is information representing whether style
• FIG. 10B shows the function "user_changeable _styleset()" defined in the function
• the function user_changeable_styleset() defines types and a
• the style information modifiable by the user is limited to a
• region_horizontal_position_direction
• region_horizontal__position_delta region_vertical_position_direction, region_
• the function user_changeable_styleset() is defined according to the
• region_style_id and a plurality of user modification style information are
• region_ horizontal_position_direction and the region_vertical_position _direction are
• region_vertical_position which can be modified according to the user_style_id. Also, the
• region_horizontaljposition_delta and region_vertical_position_ delta are provided for
• region_horizontal_position_direction is defined as 1, the
• region_vertical_position_direction is defined as 1, the corresponding region is moved up.
• a font_size_inc_dec is provided for defining a direction of increasing/decreasing of the
• font size which is changeable according to the user_style_id; and a font_size_delta is
• font_size_inc_dec 0 if the font_size_inc_dec is defined as 0 if the font_size_inc_dec is defined as 0
• the font_size_inc_dec is defined as 1, it means decrease the font_size.
• the text_box_horizontal_position and the text_box_vertical_position may be
• text_box_vertical_position are recorded for assigning the changing direction and a
• a text_box_width_inc_dec and a text_box_height_inc_dec are examples of the font_size.
• text_box_height_delta are recorded for assigning a one time modification amount in a unit of
• FIGs. 11A and 11B show examples of displaying a text box according a
• FIG. 10 A the first embodiment of the present invention shown in FIG. 10 A.
• FIG. 11A shows that the text_box_horizontaljposition
• text_box_vertical_position and the text_flow are defined to display the text data with respect
• an origin of the text data becomes the left-top (also referred to as
• FIG. 11B shows the display of text data in a textbox based on the
• the textbox is defined with respect to the
• an origin of the text data becomes the left-top of the text
• FIGs. 12A to 12C show another example of displaying a text box according a
• FIG. 10A according to the first embodiment of the present invention shown in FIG. 10A.
• FIG. 12 A shows that the text_box_ horizontal_position
• text_box_verticaljposition and the text_flow are defined to display the text data at left-top
• FIG. 12B shows that the text_box_ horizontal_position
• the text_box_vertical_position and the text_flow are defined to display the text data at right-
• FIG. 12C shows that the text_box_
• FIG. 13A shows a function dialog_styleset() defined in the function dialog_style_unit() in
• the dialog_style_unit() records text padding information instead of the text box information.
• the text padding information is
• the text padding information includes a
• padding_top a padding_bottom, a padding_left and a paddingjright.
• an entire size of the text data in the region may be confirmed.
• FIG. 13B shows a position of the text data in a region having text padding information.
• FIG. 14A shows a function dialog_styleset() defined in the function dialog_style_unit() in
• dialog_styleset() records a text_horizontal position and a text_vertical_position instead of
• the reference position is defined to be modified according to the text_alignment such as left, center and right.
• FIGs. 14B to 14D shows positions of the text data if the text flow is left to right or right to
• FIG. 14B left, and the text_alignment is defined as left (FIG. 14B) a center (FIG. 14C) or right (FIG.
• text_horizontaljposition and the text_vertical_position are defined as assigning a left position
• the text_horizontal_position and the text__vertical position are defined to
• text_vertical position are defined as assigning a right position where a first line of the text
• FIGs. 14E to 14G shows positions of the text data if the text flow is top to bottom
• text_alignment is defined as top(left) (FIG. 14E) a center (FIG. 14F) and a bottom(right) (FIG.
• the text vertical position are defined to assign a top position where a first line of the text data
• the textjhorizontal position and the text_verticaljposition are defined as
• the text data is displayed with the main AN stream the display by
• FIG. 15 is a diagram illustrating information included in the dialog presentation unit (DPU)
• the DSU includes a set of
• region style information applied to each region in each dialog and the DPU includes dialog
• the dialog text information includes a region style identifier defining style information
• the region style identifier is information for linking a corresponding region to region style
• DSU dialog style information unit
• the presentation information in the DPU includes a presentation time stamp (PTS) start time
• PTS_start and a presentation time stamp end time (PTS_end) for displaying each dialog
• palette_update_flag a palette update information for changing colors used during display
• the text subtitle stream is constructed with the dialog style information in the DSU
• DSU and the DPU are classified into three types of information according to functions of the
• the information is classified into dialog text information
• composition information including times for display, positions of the
• information in the DSU is used as the composition information and as
• the information are used for expressing texts according to each region of each dialog. Also,
• the information "text position” such as text box information, text padding information and
• FIG. 16 is a diagram illustrating an optical disk reproducing apparatus including a decoding
• the optical disk reproducing apparatus includes a micro-computer 3, a
• system decoder 4 a PID filter 5
• audio decoding unit 10 a video decoding unit 20
• video decoding unit 20 a
• graphic decoding unit 30 a subtitle decoding unit 40, a selecting unit 6 and a mixing unit 50.
• the system decoder 4 decodes signals reproduced from an optical disc into a AN stream (e.g.,
• micro-computer 3 also controls the other elements of the apparatus based on input
• a user e.g., via control buttons on the apparatus or a remote control
• a remote control e.g., via control buttons on the apparatus or a remote control
• PID filter 5 receives the AN stream and from the system decoder 4 extracts the separate
• streams that are present such as a video stream, an audio stream, a graphic stream and a text
• PID packet identifier
• the video decoding unit 20 receives the extracted video stream from the PID
• filter 5 decodes the extracted video stream for reproducing the extracted video stream.
• the audio decoding unit 10 receives the extracted audio stream from the PID filter 5 and
• the graphic decoding unit 30 receives the extracted graphic stream from the PID filter 5 and decodes the
• decoding unit 40 receives the extracted text subtitle stream from the P-D filter 5 and decodes
• the extracted text subtitle stream for reproducing the extracted text subtitle stream.
• the optical disk reproducing apparatus may also or instead receive the text subtitle from an
• the optical disk reproducing apparatus of this embodiment may be any optical disk reproducing apparatus. Therefore, the optical disk reproducing apparatus of this embodiment may be any optical disk reproducing apparatus.
• a selecting unit 6 for selecting an input source for the text subtitle decoding
• the input source If the text subtitle is recorded with the main data based on a MPEG format, the input source
• the selecting unit 6 selects the PID filter 5 as the input
• source of the text subtitle stream and the selecting unit 6 transfers the extracted text subtitle
• optical disk reproducing apparatus receives the text subtitle from an external source
• the selecting unit 6 selects the external source as the input source of the text subtitle stream
• the selecting unit 6 transfers the text subtitle stream from the external source to the text
• subtitle decoding unit 40 which is shown as B in FIG. 16.
• the video decoding unit 20 the audio decoding unit 10 and the graphic decoding unit 30
• the video decoding unit 20 also includes a video decoder 22 and a
• decoded graphic data which is single graphic image frame for display with the generated
• the graphic decoding unit 30 further includes a color look up table (GLUT) 34.
• GLUT color look up table
• the GLUT 34 includes vales for controlling a color and a transparency of the generated
• the text subtitle decoding unit 40 includes a preloading buffer 41, a TXT-ST decoder 42, a
• the text subtitle decoding unit 40 receives the text
• preloading buffer 41 Generally, a size of single test subtitle data including reproducing
• preloading buffer 41 should be much more than 0.5 Mbyte.
• the size of the preloading buffer 41 should be much more than 0.5 Mbyte.
• preloading buffer 41 may be standardized by considering the size of the text subtitle data.
• the text subtitle data is preloaded in the preloading buffer 41 because of following a reason.
• the text subtitle data may be recorded in a separate file since a size of entire text subtitle is
• controlling the buffer is more convenient by preloading the entire subtitle data in the preloading buffer 41.
• the text subtitle (TXT-ST) decoder 42 reads the text subtitle data stored in the preloading
• the graphics plane 43 generates a subtitle
• graphic plane which is a single subtitle image frame for display with the graphic plane
• subtitle graphic plane are controlled according to values in the CLUT 44 for overlapping the
• subtitle graphic plane with the graphic plane and the video plane.
• the mixing unit 50 of the optical disk reproducing apparatus includes two adders 52 and 53
• the text subtitle decoding unit 40 and for generating video image frames with corresponding
• the mixing unit 50 receives the video plane generated
• the video plane becomes a background of the
• the order of overlapping is determined according to characteristics of the
• graphic plane and the subtitle graphic plane.
• the graphic plane is a
• the graphic plane is overlapped on the video plane by the adder 52 in
• the subtitle graphic plane generated by the text subtitle decoding unit 40 is overlapped on the output of the adder 52 by the adder 53 of the mixing unit 50.
• subtitle graphic plane is overlapped on the video plane by the adder 52 in the mixing unit 50
• FIG. 17 is a diagram illustrating the text subtitle decoding unit 40 in accordance with an
• FIGs. 1 to 16 and FIG. 17 explained in detail by referring FIGs. 1 to 16 and FIG. 17.
• the optical disk reproducing apparatus reads and stores file
• the apparatus reproduces the playlist related to the title. For example, if the playlist shown in
• FIG. 4 is reproduced, the optical disk reproducing apparatus reproduces the main AN data
• font file is extracted from the optical disk according to the font information assigned by the text subtitle stream.
• the extracted font file is stored in a font preloading buffer 410.
• font file aaaaa.font is extracted according to the font information assigned in the clip
• preloading buffer 410 After extracting and storing the corresponding text subtitle stream,
• the text subtitle decoding unit 40 decodes the text subtitle stream for generating the subtitle
• the decoding of the text subtitle stream is classified into three steps.
• the first step the text
• subtitle stream is separated according to a purpose. That is, the composition information,
• rendering information and the dialog text information are separated from the text subtitle
• parsing This act of separating data is commonly called parsing.
• the text data included in the dialog text information is rendered as bitmap
• rendering data by using the rendering information. This is called rendering.
• the rendered text data is added in the graphic plane based on the composition
• bitmap data is added to the graphic plane for reproducing the text
• composition This is called composition.
• the text subtitle decoder 42 includes a text subtitle (TXT_ST) processor 421 that stores the separated composition information and the rendering
• DCB dialog composition buffer
• DB dialog buffer
• the text subtitle decoder 42 includes a text renderer 423 and a
• dialog presentation controller (DP) 426 As discussed above, in this step, the text data among
• renderer 423 renders the text data to bitmap data by using the inline style information applied
• bitmap data is stored in a bitmap
• object buffer (BOB) 424 For purposes of object buffer (BOB) 424.
• the "object" stored in the BOB 426 is text data of each region in the dialog that has been
• the rendering step may be performed by at least two methods.
• the first method the first method
• text data may be rendered after confirming the origin where the text data is to be displayed
• the text subtitle decoder 42 includes the DP controller 426 arranges
• the palette information among the composition information is inputted to the
• subtitle graphic plane with the video plane to generate the video image frames with the
• a user may change the style information in the rendering step and the
• the DP controller 426 receives user input and performs the
• the user may be limited to the region position and the font size.
• FIG. 18 is a view showing the decoding the text subtitle by the parsing step, the rendering
• the rendering step is performed by using the rendering information and the dialog text
• the text subtitle stream file is recorded in the optical disk as

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• 2005
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  • 2005-05-02 RU RU2006142693/28A patent/RU2384898C2/ru active
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